i have a 3 year old savannah monitor. He doesn't go to the bathroom in his enclosure. He will hold for week plus until I take him out and he poops on the floor. Is this normal, is it a behavioral issue. He is 3.5 ft long, eats dubias roaches every other day, small rat once a week, once in awhile when I'm cutting up chicken breast , I'll give him some trimmings. His enclosure is 8 ft long 3 ft wide and 4 ft tall. He has a hide on his cool side 84/85 degrees. Then in his hot side I have a 6 ft congergtated pipe underneath the dirt for additional hide plus adds demention to his enclosure . Hot side is 90 and his basking area is at 130 degrees. I have a heat panel with a thermastat on cool end and uvb bulb in the middle, another heat panel on the hot end without a thermastat . Basking light are 2 halogen flood lights.